on top of the computer you should find a wiring harnes one of them dose not have a end. and that is war you plug it in. on the right kick panel.
Check for codes if you have a check engine light illuminating.
If the check engine light is on with no codes, you have a wiring or computer issue.
To read a check engine code a person will need a code reader. They can also take their vehicle to an Auto Zone store and have them read the codes and explain what they mean for free.
its under the drivers side dase
turn the key on and off 3 times and count the check engine flashes
55 Means End of Code... Its nothing to worry about. Just means there is no codes
You don't
There is no OBD connection on a 1990 Nissan as that is an OBD1 vehicle not OBD2. However there is a way to read the codes. https://codes.rennacs.com/Petrol-Engine/Japanese-Korean/Nissan-Engines.php
what is code 14 in Honda civic 1990
Have vehicle scanned to determine problem and recover codes Could be a bad coolant temperature sensor
The check engine light cannot be retrieved on a 1990 Cavalier unless a problem develops with the engine. The engine can be checked for errors, though, by using a tester that is plugged into the vehicle's computer.
It could be the coil pack or the crankshaft position sensor. run the codes by turning the key on, off, on, off, on without turn the key to start position. shotly after the check engine light goes off, the check engine lght will flash 2 digit fault codes. if 11 is one of the codes its likely a bad crank sensor.